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σ (EN)
文字、記号

文字 “σ”

σ, sigma
  1. ギリシャ文字の第十八字母、小文字のシグマ。
    In Greek language classes, students learn that σ is the lowercase form of sigma.

記号 “σ”

σ
  1. (数学)統計における標準偏差を表す記号。
    The statistician calculated σ to understand how the data varied from the mean.
  2. (物理学)電気伝導率を表す記号。
    The electrical conductivity σ increases with temperature in this material.
  3. (物理学)断面積を表す記号
    The scattering cross-section σ is crucial in nuclear physics experiments.